Alcohol is a form of drug known as depressant and cause depression, which can slow down the activity of the nervous system.
Alcohol is a central nervous system depressant drug that gradually inhibits brain function, which in turn impairs the functioning of the central nervous system.
Alcohol is a depressant that also exhibits stimulant effects, which is said to be useful for stimulation when taken in small amounts.
The person acted to be 'alive and more outgoing' at a party, which should be said for excitement, and that the slowing down of the drug was the effect of depression.